Accounts Payable Specialist - Brex Super User

About Mercor

Mercor is at the intersection of labor markets and AI research. We partner with leading AI labs and enterprises to provide the human intelligence essential to AI development.

Our vast talent network trains frontier AI models in the same way teachers teach students: by sharing knowledge, experience, and context that can't be captured in code alone. Today, more than 30,000 experts in our network collectively earn over $1.5 million a day.

Mercor is creating a new category of work where expertise powers AI advancement. Achieving this requires an ambitious, fast-paced and deeply committed team. You’ll work alongside researchers, operators, and AI companies at the forefront of shaping the systems that are redefining society.

Mercor is a profitable Series C company valued at $10 billion. We work in-person five days a week in our new San Francisco headquarters.

About the Role

The AP Specialist will serve as the accounting team’s Brex super user, owning vendor management, invoice processing, and accurate, timely disbursements. This role requires deep expertise in Brex, strong technical proficiency in QuickBooks Online (QBO) and Excel/Google Sheets, and the ability to operate effectively in a fast-paced startup environment. The company will implement a new ERP, Rillet, in early 2026, with Brex integration to ensure AP transactions and payment information are captured in Rillet.

What You’ll Do

• Invoice & Payment Processing: Manage the AP inbox, process invoices and review expense reimbursements, and credit card purchases, ensuring timely vendor payments through Brex.

• Vendor Management: Oversee vendor setup, maintenance, and cleanup to ensure accurate records.

• 1099 Compliance: Prepare and file 1099s ensuring vendor payments are accurately classified and assigned to the appropriate 1099 form type

• Month-End Close Support: Assist with reconciliations, accruals, and AP-related close tasks.

• Process Improvement: Support classification cleanup, document workflows, and contribute to automation initiatives.

• System Integration: Partner with the Controller and Head of Finance on Brex–QBO integration and upcoming Rillet implementation.

• Cross-Functional Collaboration: Work closely with finance leadership to maintain spend controls, budgets, and compliance.

What We’re Looking For

• Proven Brex super user experience in AP, vendor management, and expense control.

• Strong proficiency in QBO for accounting operations.

• Advanced skills in Excel/Google Sheets (pivot tables, VLOOKUP, data analysis, reporting).

• Excellent organizational and communication skills; detail-oriented with a proactive mindset.

• Ability to deliver high-quality work consistently in a startup/high-growth environment.

• A track record of thriving in fast-paced, results-driven environments (startups, consulting, finance, or similar)

• Professionalism and adaptability to evolving systems and processes.

Compensation

• Base salary

• Quarterly performance bonus

• Generous equity grant vested over 4 years

• Comprehensive benefits package

• A $20K relocation bonus (if moving to the Bay Area)

• A $10K housing bonus (if you live within 0.5 miles of our office)

• A $1K monthly stipend for meals

• Free Equinox membership

• Health insurance